Linux 2.6.34-rc3
[pohmelfs.git] / drivers / mfd / adp5520.c
blobb26644772d02fee2fc32ef6dd97ed69d0c052f5b
1 /*
2 * Base driver for Analog Devices ADP5520/ADP5501 MFD PMICs
3 * LCD Backlight: drivers/video/backlight/adp5520_bl
4 * LEDs : drivers/led/leds-adp5520
5 * GPIO : drivers/gpio/adp5520-gpio (ADP5520 only)
6 * Keys : drivers/input/keyboard/adp5520-keys (ADP5520 only)
8 * Copyright 2009 Analog Devices Inc.
10 * Derived from da903x:
11 * Copyright (C) 2008 Compulab, Ltd.
12 * Mike Rapoport <mike@compulab.co.il>
14 * Copyright (C) 2006-2008 Marvell International Ltd.
15 * Eric Miao <eric.miao@marvell.com>
17 * Licensed under the GPL-2 or later.
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/platform_device.h>
23 #include <linux/init.h>
24 #include <linux/interrupt.h>
25 #include <linux/irq.h>
26 #include <linux/err.h>
27 #include <linux/i2c.h>
29 #include <linux/mfd/adp5520.h>
31 struct adp5520_chip {
32 struct i2c_client *client;
33 struct device *dev;
34 struct mutex lock;
35 struct blocking_notifier_head notifier_list;
36 int irq;
37 unsigned long id;
40 static int __adp5520_read(struct i2c_client *client,
41 int reg, uint8_t *val)
43 int ret;
45 ret = i2c_smbus_read_byte_data(client, reg);
46 if (ret < 0) {
47 dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
48 return ret;
51 *val = (uint8_t)ret;
52 return 0;
55 static int __adp5520_write(struct i2c_client *client,
56 int reg, uint8_t val)
58 int ret;
60 ret = i2c_smbus_write_byte_data(client, reg, val);
61 if (ret < 0) {
62 dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
63 val, reg);
64 return ret;
66 return 0;
69 static int __adp5520_ack_bits(struct i2c_client *client, int reg,
70 uint8_t bit_mask)
72 struct adp5520_chip *chip = i2c_get_clientdata(client);
73 uint8_t reg_val;
74 int ret;
76 mutex_lock(&chip->lock);
78 ret = __adp5520_read(client, reg, &reg_val);
80 if (!ret) {
81 reg_val |= bit_mask;
82 ret = __adp5520_write(client, reg, reg_val);
85 mutex_unlock(&chip->lock);
86 return ret;
89 int adp5520_write(struct device *dev, int reg, uint8_t val)
91 return __adp5520_write(to_i2c_client(dev), reg, val);
93 EXPORT_SYMBOL_GPL(adp5520_write);
95 int adp5520_read(struct device *dev, int reg, uint8_t *val)
97 return __adp5520_read(to_i2c_client(dev), reg, val);
99 EXPORT_SYMBOL_GPL(adp5520_read);
101 int adp5520_set_bits(struct device *dev, int reg, uint8_t bit_mask)
103 struct adp5520_chip *chip = dev_get_drvdata(dev);
104 uint8_t reg_val;
105 int ret;
107 mutex_lock(&chip->lock);
109 ret = __adp5520_read(chip->client, reg, &reg_val);
111 if (!ret && ((reg_val & bit_mask) == 0)) {
112 reg_val |= bit_mask;
113 ret = __adp5520_write(chip->client, reg, reg_val);
116 mutex_unlock(&chip->lock);
117 return ret;
119 EXPORT_SYMBOL_GPL(adp5520_set_bits);
121 int adp5520_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
123 struct adp5520_chip *chip = dev_get_drvdata(dev);
124 uint8_t reg_val;
125 int ret;
127 mutex_lock(&chip->lock);
129 ret = __adp5520_read(chip->client, reg, &reg_val);
131 if (!ret && (reg_val & bit_mask)) {
132 reg_val &= ~bit_mask;
133 ret = __adp5520_write(chip->client, reg, reg_val);
136 mutex_unlock(&chip->lock);
137 return ret;
139 EXPORT_SYMBOL_GPL(adp5520_clr_bits);
141 int adp5520_register_notifier(struct device *dev, struct notifier_block *nb,
142 unsigned int events)
144 struct adp5520_chip *chip = dev_get_drvdata(dev);
146 if (chip->irq) {
147 adp5520_set_bits(chip->dev, ADP5520_INTERRUPT_ENABLE,
148 events & (ADP5520_KP_IEN | ADP5520_KR_IEN |
149 ADP5520_OVP_IEN | ADP5520_CMPR_IEN));
151 return blocking_notifier_chain_register(&chip->notifier_list,
152 nb);
155 return -ENODEV;
157 EXPORT_SYMBOL_GPL(adp5520_register_notifier);
159 int adp5520_unregister_notifier(struct device *dev, struct notifier_block *nb,
160 unsigned int events)
162 struct adp5520_chip *chip = dev_get_drvdata(dev);
164 adp5520_clr_bits(chip->dev, ADP5520_INTERRUPT_ENABLE,
165 events & (ADP5520_KP_IEN | ADP5520_KR_IEN |
166 ADP5520_OVP_IEN | ADP5520_CMPR_IEN));
168 return blocking_notifier_chain_unregister(&chip->notifier_list, nb);
170 EXPORT_SYMBOL_GPL(adp5520_unregister_notifier);
172 static irqreturn_t adp5520_irq_thread(int irq, void *data)
174 struct adp5520_chip *chip = data;
175 unsigned int events;
176 uint8_t reg_val;
177 int ret;
179 ret = __adp5520_read(chip->client, ADP5520_MODE_STATUS, &reg_val);
180 if (ret)
181 goto out;
183 events = reg_val & (ADP5520_OVP_INT | ADP5520_CMPR_INT |
184 ADP5520_GPI_INT | ADP5520_KR_INT | ADP5520_KP_INT);
186 blocking_notifier_call_chain(&chip->notifier_list, events, NULL);
187 /* ACK, Sticky bits are W1C */
188 __adp5520_ack_bits(chip->client, ADP5520_MODE_STATUS, events);
190 out:
191 return IRQ_HANDLED;
194 static int __remove_subdev(struct device *dev, void *unused)
196 platform_device_unregister(to_platform_device(dev));
197 return 0;
200 static int adp5520_remove_subdevs(struct adp5520_chip *chip)
202 return device_for_each_child(chip->dev, NULL, __remove_subdev);
205 static int __devinit adp5520_probe(struct i2c_client *client,
206 const struct i2c_device_id *id)
208 struct adp5520_platform_data *pdata = client->dev.platform_data;
209 struct platform_device *pdev;
210 struct adp5520_chip *chip;
211 int ret;
213 if (!i2c_check_functionality(client->adapter,
214 I2C_FUNC_SMBUS_BYTE_DATA)) {
215 dev_err(&client->dev, "SMBUS Word Data not Supported\n");
216 return -EIO;
219 if (pdata == NULL) {
220 dev_err(&client->dev, "missing platform data\n");
221 return -ENODEV;
224 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
225 if (!chip)
226 return -ENOMEM;
228 i2c_set_clientdata(client, chip);
229 chip->client = client;
231 chip->dev = &client->dev;
232 chip->irq = client->irq;
233 chip->id = id->driver_data;
234 mutex_init(&chip->lock);
236 if (chip->irq) {
237 BLOCKING_INIT_NOTIFIER_HEAD(&chip->notifier_list);
239 ret = request_threaded_irq(chip->irq, NULL, adp5520_irq_thread,
240 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
241 "adp5520", chip);
242 if (ret) {
243 dev_err(&client->dev, "failed to request irq %d\n",
244 chip->irq);
245 goto out_free_chip;
249 ret = adp5520_write(chip->dev, ADP5520_MODE_STATUS, ADP5520_nSTNBY);
250 if (ret) {
251 dev_err(&client->dev, "failed to write\n");
252 goto out_free_irq;
255 if (pdata->keys) {
256 pdev = platform_device_register_data(chip->dev, "adp5520-keys",
257 chip->id, pdata->keys, sizeof(*pdata->keys));
258 if (IS_ERR(pdev)) {
259 ret = PTR_ERR(pdev);
260 goto out_remove_subdevs;
264 if (pdata->gpio) {
265 pdev = platform_device_register_data(chip->dev, "adp5520-gpio",
266 chip->id, pdata->gpio, sizeof(*pdata->gpio));
267 if (IS_ERR(pdev)) {
268 ret = PTR_ERR(pdev);
269 goto out_remove_subdevs;
273 if (pdata->leds) {
274 pdev = platform_device_register_data(chip->dev, "adp5520-led",
275 chip->id, pdata->leds, sizeof(*pdata->leds));
276 if (IS_ERR(pdev)) {
277 ret = PTR_ERR(pdev);
278 goto out_remove_subdevs;
282 if (pdata->backlight) {
283 pdev = platform_device_register_data(chip->dev,
284 "adp5520-backlight",
285 chip->id,
286 pdata->backlight,
287 sizeof(*pdata->backlight));
288 if (IS_ERR(pdev)) {
289 ret = PTR_ERR(pdev);
290 goto out_remove_subdevs;
294 return 0;
296 out_remove_subdevs:
297 adp5520_remove_subdevs(chip);
299 out_free_irq:
300 if (chip->irq)
301 free_irq(chip->irq, chip);
303 out_free_chip:
304 i2c_set_clientdata(client, NULL);
305 kfree(chip);
307 return ret;
310 static int __devexit adp5520_remove(struct i2c_client *client)
312 struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
314 if (chip->irq)
315 free_irq(chip->irq, chip);
317 adp5520_remove_subdevs(chip);
318 adp5520_write(chip->dev, ADP5520_MODE_STATUS, 0);
319 i2c_set_clientdata(client, NULL);
320 kfree(chip);
321 return 0;
324 #ifdef CONFIG_PM
325 static int adp5520_suspend(struct i2c_client *client,
326 pm_message_t state)
328 struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
330 adp5520_clr_bits(chip->dev, ADP5520_MODE_STATUS, ADP5520_nSTNBY);
331 return 0;
334 static int adp5520_resume(struct i2c_client *client)
336 struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
338 adp5520_set_bits(chip->dev, ADP5520_MODE_STATUS, ADP5520_nSTNBY);
339 return 0;
341 #else
342 #define adp5520_suspend NULL
343 #define adp5520_resume NULL
344 #endif
346 static const struct i2c_device_id adp5520_id[] = {
347 { "pmic-adp5520", ID_ADP5520 },
348 { "pmic-adp5501", ID_ADP5501 },
351 MODULE_DEVICE_TABLE(i2c, adp5520_id);
353 static struct i2c_driver adp5520_driver = {
354 .driver = {
355 .name = "adp5520",
356 .owner = THIS_MODULE,
358 .probe = adp5520_probe,
359 .remove = __devexit_p(adp5520_remove),
360 .suspend = adp5520_suspend,
361 .resume = adp5520_resume,
362 .id_table = adp5520_id,
365 static int __init adp5520_init(void)
367 return i2c_add_driver(&adp5520_driver);
369 module_init(adp5520_init);
371 static void __exit adp5520_exit(void)
373 i2c_del_driver(&adp5520_driver);
375 module_exit(adp5520_exit);
377 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
378 MODULE_DESCRIPTION("ADP5520(01) PMIC-MFD Driver");
379 MODULE_LICENSE("GPL");